Optic fibres are increasingly being used to carry information. They can transmit over 10gigabytes per second and a single 1.9 cm cable can replace 20 normal 8.9 cm coaxial cables.

• 光纤被日益广泛地用作信息载体，它们传输信息 的速度超过每秒10千兆字节，一根1.；9厘米的光纤可 以代替20根常规的8